link to Theano-PyMC 1.1.0 release notes, mention BART.predict, update release date

Author: Spaak

RELEASE-NOTES.md

@@ -1,6 +1,6 @@
 # Release Notes
 
-## PyMC3 3.11.0 (19 January 2021)
+## PyMC3 3.11.0 (21 January 2021)
 
 This release breaks some APIs w.r.t. `3.10.0`. It also brings some dreadfully awaited fixes, so be sure to go through the (breaking) changes below.
 
@@ -13,7 +13,7 @@ This release breaks some APIs w.r.t. `3.10.0`. It also brings some dreadfully aw
   - 0-length dimensions are now ruled illegal for random variables and raise a `ValueError`.
 - In `sample_prior_predictive` the `vars` kwarg was removed in favor of `var_names` (see [#4327](https://github.com/pymc-devs/pymc3/pull/4327)).
 - Removed `theanof.set_theano_config` because it illegally changed Theano's internal state (see [#4329](https://github.com/pymc-devs/pymc3/pull/4329)).
-- We now depend on `Theano-PyMC` version `1.1.0` or greater (see [#4405](https://github.com/pymc-devs/pymc3/pull/4405)).
+- We now depend on `Theano-PyMC` version `1.1.0` exactly (see [#4405](https://github.com/pymc-devs/pymc3/pull/4405)). Major refactorings were done in `Theano-PyMC` 1.1.0. If you implement custom `Op`s or interact with Theano in any way yourself, make sure to read the [Theano-PyMC 1.1.0 release notes](https://github.com/pymc-devs/Theano-PyMC/releases/tag/rel-1.1.0).
 
 ### New Features
 - Option to set `check_bounds=False` when instantiating `pymc3.Model()`. This turns off bounds checks that ensure that input parameters of distributions are valid. For correctly specified models, this is unneccessary as all parameters get automatically transformed so that all values are valid. Turning this off should lead to faster sampling (see [#4377](https://github.com/pymc-devs/pymc3/pull/4377)).
@@ -23,6 +23,7 @@ This release breaks some APIs w.r.t. `3.10.0`. It also brings some dreadfully aw
 - Add `random` method to `MvGaussianRandomWalk` (see [#4388](https://github.com/pymc-devs/pymc3/pull/4388))
 - `AsymmetricLaplace` distribution added (see [#4392](https://github.com/pymc-devs/pymc3/pull/4392)).
 - `DirichletMultinomial` distribution added (see [#4373](https://github.com/pymc-devs/pymc3/pull/4373)).
+- Added a new `predict` method to `BART` to compute out of sample predictions (see [#4310](https://github.com/pymc-devs/pymc3/pull/4310)).
 
 ### Maintenance
 - Fixed bug whereby partial traces returns after keyboard interrupt during parallel sampling had fewer draws than would've been available [#4318](https://github.com/pymc-devs/pymc3/pull/4318)